单项选择题

She couldn't help ______ when she heard the news.

A．laugh
B．to laugh
C．laughing
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单项选择题
You ______ talk so loud in the library.
A．needn't
B．may not
C．mustn't
单项选择题
I want to have some ______, please.
A．potatos
B．tomatos
C．oranges
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